feat: add ability to browse and search through VS Code

Previously, this extension only supported features that allowed the user
to open Sourcegraph in the browser for further exploration. This commits
adds several new features that allows the user to browse Sourcegraph
while staying in the editor:

- New Sourcegraph file system with tree view
- New Sourcegraph notebooks to run search queries

Author: olafurpg

.tool-versions

@@ -0,0 +1 @@
+yarn 1.22.4

.vscode/settings.json

@@ -7,4 +7,5 @@
     "out": true, // set this to false to include "out" folder in search results
   },
   "eslint.validate": ["typescript"],
+  "editor.formatOnSave": true,
 }

README.md

@@ -16,11 +16,12 @@ In the command palette (<kbd>Cmd</kbd>+<kbd>Shift</kbd>+<kbd>P</kbd> or <kbd>Ctr
 
 Keyboard Shortcuts:
 
-| Description                     | Mac                            | Linux / Windows             |
-| ------------------------------- | ------------------------------ | --------------------------- |
-| Open file in Sourcegraph        | <kbd>Option</kbd>+<kbd>A</kbd> | <kbd>Alt</kbd>+<kbd>A</kbd> |
-| Search selection in Sourcegraph | <kbd>Option</kbd>+<kbd>S</kbd> | <kbd>Alt</kbd>+<kbd>S</kbd> |
-| Search on Sourcegraph           | <kbd>Option</kbd>+<kbd>Q</kbd> | <kbd>Alt</kbd>+<kbd>Q</kbd> |
+| Description                              | Mac                            | Linux / Windows             |
+| ---------------------------------------- | ------------------------------ | --------------------------- |
+| Sourcegraph: Open file in browser        | <kbd>Option</kbd>+<kbd>A</kbd> | <kbd>Alt</kbd>+<kbd>A</kbd> |
+| Sourcegraph: Go to file in editor        | <kbd>Option</kbd>+<kbd>F</kbd> | <kbd>Alt</kbd>+<kbd>F</kbd> |
+| Sourcegraph: Go to repository in editor  | <kbd>Option</kbd>+<kbd>R</kbd> | <kbd>Alt</kbd>+<kbd>R</kbd> |
+| Sourcegraph: Search selection in browser | <kbd>Option</kbd>+<kbd>S</kbd> | <kbd>Alt</kbd>+<kbd>S</kbd> |
 
 ## Extension Settings
 
@@ -29,6 +30,8 @@ This extension contributes the following settings:
 - `sourcegraph.url`: Specify your on-premises Sourcegraph instance here, if applicable. For example: `"sourcegraph.url": "https://sourcegraph.com"`
 - `sourcegraph.remoteUrlReplacements`: Object, where each `key` is replaced by `value` in the remote url.
 - `sourcegraph.defaultBranch`: String to set the name of the default branch. Always open files in the default branch.
+- `sourcegraph.recentlyOpenFiles`: List of strings for recently visited files. This setting is automatically managed by the extension.
+- `sourcegraph.recentlyOpenRepositories`: List of strings for recently visited repositories. This setting is automatically managed by the extension.
 
 ## Questions & Feedback